Games like Shard Squad
Games like Shard Squad include Megabonk, Vampire Survivors, Death Must Die, Halls of Torment, and Enter the Gungeon. We matched them by the tags players give Shard Squad on Steam (Bullet Heaven, Action Roguelike, Creature Collector, Bullet Hell, and Roguelite): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Bullet Heaven · Action Roguelike · Roguelite

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Death Must Die
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Halls of Torment
Shared: Action Roguelike · Bullet Hell · Roguelite

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

Brotato
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

The Spell Brigade
Shared: Bullet Heaven · Bullet Hell · Roguelite

Sephiria
Shared: Action Roguelike · Roguelite · Roguelike

Skul: The Hero Slayer
Shared: Action Roguelike · Pixel Graphics · Roguelite

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Soulstone Survivors
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

BALL x PIT
Shared: Roguelite · Bullet Hell · Action Roguelike

Nuclear Throne
Shared: Action Roguelike · Pixel Graphics · Roguelike

Dead Cells
Shared: Action Roguelike · Roguelike · Pixel Graphics

Tower of Babel: Survivors of Chaos
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Roguelite

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Pixel Graphics

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Rogue: Genesia
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Rabbit and Steel
Shared: Action Roguelike · Bullet Hell · Co-op

Streets of Rogue
Shared: Action Roguelike · Roguelite · Pixel Graphics

Atomicrops
Shared: Bullet Hell · Action Roguelike · Roguelike

Nordic Ashes: Survivors of Ragnarok
Shared: Bullet Heaven · Action Roguelike · Bullet Hell